IRC SP 041: Guidelines for the Design of At-Grade Intersections in Rural and Urban Areas
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Special Publication 41 GUIDELINES FOR THE DESIGN OF AT-GRADE INTERSECTIONS IN RURAL & URBAN AREAS THE INDIAN ROADS CONGRESS 1994 Digitized by the Internet Archive in 2014 https://archive.org/details/govlawircy1994sp41_0 Special Publication 41 GUIDELINES FOR THE DESIGN OF AT-GRADE INTERSECTIONS IN RURAL & URBAN AREAS THE INDIAN ROADS CONGRESS 1994 1 Published in September 1994 Reprinted : February. 2007 Reprinted December 20 1 (Rights of Publication and Translation are Reserved) Published by: The Indian Roads Congress Copies can be had from the Secretary General, Indian Roads Congress, Jamnagar House, Shahjahan Road, New Delhi- 11 0001 NEW DELHI 1 994 Price Rs. 200/- (Plus Packing & Postage) Edited and Published by Shri D.P. Gupta, Secretary, Indian Roads Congress, New Delhi Published at : Aravali Printers & Publishers Pvt. Ltd. W-30, Okhla Phase II, New Delhi (500 Copies) MEMBERS OF THE HIGHWAYS SPECIFICATIONS AND STANDARDS COMMITTEE (AS ON 1-9-92) 1. R.P.Sikka Addl. Director General (Roads), {Convenor) Ministry of Surface Transport (Roads Wing) 2. P. K. Dutta Chief Engineer (Roads) (Member - Secretary) Ministry of Surface Transport (Roads Wing) 3. G. R. Ambwani Engineer-in-Chief, Municipal Corporation of Delhi 4. S.R. Agarwal General Manager (R), Rail India Technical & Economic Services Ltd. 5. V. K. Arora Chief Engineer (Roads), Ministry of Surface Transport, (Roads Wing) 6. R.K. Banerjee Engineer-in-Chief & Ex-officio Secretary to Govt, of West Bengal 7. Dr. S. Raghava Chari Professor, Transport Engg. Section, Deptt. of Civil Engg., Regional Engg. College, Warangal 8. Dr. M. P. Dhir Director (Engg. Co-ordination), Council of Scientific & Industrial Research 9. J.K. Dugad Chief Engineer (Retd.) 98A, MIG Flats, AD Pocket, Pitam Pura New Delhi. 10. Lt. Gen. M.S. Gosain Shanker Sadan, 57/1, Hardwar Road, Dehradun. 11. O.P. Goel Director General (Works), C.P.W.D. New Delhi 12. D.K. Gupta Chief Engineer (HQ), PWD, U.P. 13. Dr. A.K. Gupta Professor & Coordinator, University of Roorkee i 14. G. Sree Ramana Gopal Scientist - SD, Ministry of Environment & Forest 15. H.P. Jamdar Special Secretary to Govt, of Gujarat, Roads & Building Department 16. M.B. Jayawant Synthetic Asphalts, 103, Pooja Mahul Road, Chembur, Bombay 17. V.P. Kamdar Plot No. 23, Sector No. 19, Gandhinagar 18. Dr. L. R. Kadiyali Chief Consultant, S-487, Und floor, Greater Kailash-I, New Delhi 19. Ninan Koshi Addl. Director General (Bridges), Ministry of Surface Transport (Roads Wing), New Delhi 20. P.K. Lauria Secretary to Govt, of Rajasthan, Jaipur 21. N.V. Merani Secretary (Retd.) Maharashtra PWD 22. M.M. Swaroop Mathur Secretary (Retd.), Rajasthan PWD 23. Dr. A.K. Mullick Director General, National Council for Cement & Building Materials, New Delhi 24. Y.R. Phull Deputy Director, CRRI, New Delhi 25. G. Raman Deputy Director General, Bureau of Indian Standards, New Delhi 26. Prof. N. Ranganathan Prof. & Head, Deptt. of Transport Plan- ning, School of Planning & Architecture 27. P.J.Rao Deputy Director & Head, Geotechnical Engg. Division, CRRI, New Delhi 28. Prof. G.V. Rao Prof, of Civil Engg., Indian Institute of Technology, Delhi 29. R.K. Saxena Chief Engineer (Retd.), Ministry of Sur- face Transport, New Delhi 30. A. Sankaran A- 1, 7/2, 51, Shingrila, 22nd Cross Street, Basant Nagar, Madras 31. Dr. A. C. Sarna General Manager (T&T), Urban Transport Divn., RITES, New Delhi 32. Prof. C.G. Swaminathan Director, CRRI (Retd.), New Delhi 33. G. Sinha Addl. Chief Engineer (Pig.) PWD (Roads), Guwahati 34. A.R. Shah Chief Engineer (QC) & Joint Secretary, R&B Deptt. (Gujarat) 35. K.K. Sarin Director General (Road Development) & Addl. Secy, to Govt, of India, Ministry of Surface Transport (Retd.), New Delhi 36. M.K. Saxena Director, National Institute for Training of Highway Engineers, New Delhi 37. A. Sen Chief Engineer (Civil), Indian Road Con- struction Corp. Ltd., New Delhi 38. The Director Highways Research Station, Madras 39. The Director Central Road Research Institute, New Delhi 40. The President, IRC Secretary to the Govt, of Sikkim — (L.B. Chhetri) Ex-officio 4 1 . The Director General Ministry of Surface Transport (Roads Wing), (Road Development) & New Delhi Ex-officio Addl. Secretary to the Govt of India 42. The Secretary Indian Roads Congress (Ninan Koshi) Ex-officio Corresponding Members 1. S.K. Bhatnagar Deputy Director, Bitumen, Hindustan Pe- troleum Corp. Ltd. 2. Brig. C.T. Chari Chief Engineer, Bombay Zone, Bombay 3. A. Choudhuri Shalimar Tar Products, New Delhi 4. L.N. Narendra Singh IDL Chemicals Ltd., New Delhi. CONTENTS Page No. 1. Introduction 1 2. Basic Design Principles 4 3. Design Data Required 13 4. Parameters of Intersection Design 18 5. Capacity of Intersection 60 6. Use of Traffic Control Devices at Intersections 62 7. Signal Controlled Intersection 70 8. Special Considerations in Urban Areas 81 9. Lighting, Drainage, Utilities and Landscaping of Intersection 84 Appendices Appendix I Layout of Curves at the Intersection 88 Appendix II Capacity Assessment of At-grade Intersection 105 (Based on U.K. Practice) Appendix III Capacity of Unsignalised Intersection 113 Figures Figure 1.1 Intersection Selection based on Traffic Flow 4 Combination (U.K. Practice) Figure 1.2 General Types of At-Grade Intersections 5 Figure 2.1 Potential Conflict Points at Different Types of 7 Intersections Figure 2.2 Channelisation Techniques Illustrating Basic 8 Intersection Design Principles Figure 2.3 Potential Conflict Points at Different Types of 9 Intersections Figure 2.4 Staggering of Intersections 9 Figure 2.5 Analysis of Accident Types at Three Arm Intersections 10 Figure 2.6 Realignment Variation of Intersection 12 Figure 2.7 Main Road Intersections—Approach 14 Grading on Side Roads Figure 3.1 Peak Hour Traffic Flow Diagram in 16 Number of Vehicles Figure 3.2 Peak Hour Traffic Flow Diagram in PCUs 17 Figure 3.3 Collision Diagram 18 Figure 4.1 Design of Street Lanes Curve 24 Figure 4.2 Effect of Kerb Radii and Parking on Turning Paths 25 Figure 4.3 Variations in Length of Crosswalk with Corner 26 Kerb Radius and Width of Border Figure 4.4 Method of Transition Curves at Points of 28 Additional Lane Figure 4.5 Provision of Turning Lanes at Intersections 28 Figure 4.6 Method of Widening at Intersections 29 Figure 4.7 Method of Widening for Turning Lanes at Intersections 30 Figure 4.8 Typical Dimensions of Road Intersections 31 Figure 4.9 Superelevation Rates for Various Design Speeds 35 Figure 4.10 Development of Superelevation at 36 Turning Roadway Terminals Figure 4.1 1 Development of Superelevation at 37 Turning Roadway Terminals Figure 4.12 Development of Superelevation at 38 Turning Roadway Terminals Figure 4.13 Development of Superelevation at 39 Turning Roadway Terminals Figure 4.14 Minimum Sight Triangle at Uncontrolled Intersections 41 Figure 4.15 Minimum Sight Triangle at Priority Intersections 41 Figure 4.16 Trimming of Trees and Hedges Required for 42 Clear Sight Distance Figure 4. 17 General Types and Shapes of Islands 44 Figure 4.18 Details of Triangular Island Design 45 (kerbed islands, no shoulder) Figure 4.19 Details of Triangular Island Design 46 (kerbed island with shoulders) Figure 4.20 Design for Turning Roadways with 47 Minimum Corner Island Figure 4.21 Methods of Offsetting Approach Nose of 48 Channelising Island Figure 4.22 Alignment for Providing of Divisional Islands at 49 Intersections Figure 4.23 Channelising Islands 50 Figure 4.24 Offset Details of Central Islands 51 Figure 4.25 Shaping the Traffic Island 51 Figure 4.26 Shaping of Traffic Island for Different Angles of Turning 52 Figure 4.27 Details of Divisional Island Design 53 Figure 4.28 Correct Method of Shaping a Central Island 54 Figure 4.29 Progressive Layouts of T-Intersections for 56 Use on Main Highways Figure 4.30 Type Layout of a Right Hand Splay Intersection 57 Figure 4.31 Four-arm Intersection Providing Simultaneous 58 Right Turns Figure 4.32 Median Right Turn Design 59 Figure 4.33 Typical Kerb Sections 59 Figure 6.1 Typical Carriageway Markings at Road Intersections 63 Figure 6.2 Signs Used at Intersections 65 Figure 6.3 Typical Sign Posting at a Rural T-Intersection 66 Figure 6.4 Typical Sign Posting at Rural Four-Arm Intersections 67 Figure 6.5 Typical Sign Posting at an Urban T-Intersection 68 Figure 6.6 Typical Sign Posting at an Urban Four-Armed 69 Intersection Figure 7.1 Simplified Diagram of Widened Approaches at 71 Signal Controlled Intersection Figure 7.2 Suggested Layout for Offset Central Reserve 72 Figure 7.3 Offset Central Reserve with Improved Visibility 72 for Right - Turning Vehicles Figure 7.4 Early Cut-off 74 Figure 7.5 Typical Intersection Approach Road Showing 75 Pedestrain Crossing Figure 7.6 Saturation Flow and Lost Time 76 Figure 7.7 Signalised Intersection Layout and 79 Carriageway Markings Figure 7.8 Typical Layout of Traffic Signal Installations 80 Figure 8.1 Segregation of Cycle Traffic at Road Intersection 83 Figure 8.2. Cyclists Crossing at Signalised Intersection 85 Figure 1-1 Swept Path Width for Various Truck Vehicles Low Speed 88 Off Tracking in a 90° Intersection Turn Figure 1-2 Minimum Turning Path for Passenger Car 89 Design Vehicle (P) Figure 1-3 Minimum Turning Path for Single Unit Truck 90 Design Vehicle (SU) Figure 1-4 Minimum Turning Path for Semi-Trailer 91 (WB. - 12.0) Design Vehicle Figure 1-5 Minimum Turning Path for Semi-Trailer 92 (WB - 15.0) Design Vehicle Figure 1-6 Minimum Turning Path for Truck Trailer 93 (WB - 18.0) Design Vehicle - Figure 1-7 Minimum Designs for Passenger Vehicles for 90° turn 94 Figure 1-8 Minimum Designs and Single Unit Trucks and 95 Buses for 90° turn Figure 1-9 Minimum Designs for Semi-Trailer Combinations 96 (WB - 12.0) Design Vehicle Path 90° turn Figure I- 10 Minimum Designs for Semi-Trailer Combinations 97 Design (WB-15) Vehicle Path for 90° turn Figure 1-11.